Staff are unhappy with the move describing it as ‘bonkers’ and that all they want to do is show their support for England.

Royal Mail said 25,000 backroom staff not in the public view would be allowed to display flags.

A postman in south-west London said: ‘It’s bonkers, frankly. Many posties are football fans and want to show their support for England – but we’re not allowed to do so.’

The firm has come under fire from its workers for the ban. (Picture: PA)

A Royal Mail van driver in south-west London said: ‘Other vehicles use car flags without causing accidents, so why are we any different? Royal Mail drivers will be angered.’

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The firm had the same policy for the 2014 World Cup in Brazil.

Today the move was condemned by Labour MP John Spellar, who said: ‘It’s absolutely astonishing. All over England, people will be flying the flag with pride to support the national team.

‘Royal Mail bosses should get real and join their workers in backing England.’

England play their first match on Monday night against Tunisia. Police have previously warned that fans travelling to Russia to watch could ‘come across as imperialistic’ if they display the St George flag.

The tournament kicks off today when hosts Russia face Saudi Arabia.

England’s first match is on Monday. (Picture: Getty)

England are the only home nation out of the 32 competing teams. The tournament will feature 64 games over 32 days and was last won by Germany.

Speaking of the flag ban, a Royal Mail spokesperson said: ‘Flags should not be flown as Royal Mail has a duty of care both to all employees and to members of the public.

‘It’s a company-wide policy across the business which covers flags and stickers and covers trollies, bikes, vans and lorries.

‘No other flag or insignia should be carried next to the Royal Mail brand and insignias.